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Retrieving bytecode for method
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Michael Neumann  
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 More options Aug 20 2008, 6:56 am
From: Michael Neumann <mneum...@ntecs.de>
Date: Wed, 20 Aug 2008 19:56:57 +0900
Local: Wed, Aug 20 2008 6:56 am
Subject: [ruby-core:18354] Retrieving bytecode for method
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Hi,

I'd like to get the bytecode of a method in Ruby 1.9. I know that I
can compile a string or file into bytecode with:

   iseq = RubyVM::InstructionSequence.compile_file("name_of_file")

But is there a method which allows me to do access the bytecode
of a method from a running script as shown below:

   class A
     def b
       1 + 2
     end
   end

   iseq = A.bytecode_for_method(:b) # => RubyVM::InstructionSequence

If not, is it possible/hard to implement? I think there should be a
method cache somewhere which contains an instruction pointer to the
start of the method.

I'd love to experiment with translating the bytecode into a different
language (maybe Javascript), that's why I am ask :)

Regards,

   Michael


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David Majda  
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 More options Aug 21 2008, 2:33 am
From: David Majda <da...@majda.cz>
Date: Thu, 21 Aug 2008 15:33:48 +0900
Local: Thurs, Aug 21 2008 2:33 am
Subject: [ruby-core:18359] Re: Retrieving bytecode for method
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Michael Neumann napsal(a):

> I'd love to experiment with translating the bytecode into a different
> language (maybe Javascript), that's why I am ask :)

FYI, a project that translates YARV bytecode into JavaScript already exists:

   http://hotruby.yukoba.jp/

David Majda

--
Everyone gets everything he wants. --Captain Willard in Apocalypse Now

Personal :: da...@majda.cz              :: www.majda.cz
Work     :: david.ma...@impaladesign.cz :: www.impaladesign.cz


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Michael Neumann  
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 More options Aug 21 2008, 2:51 am
Newsgroups: gmane.comp.lang.ruby.core
From: Michael Neumann <mneum...@ntecs.de>
Date: Thu, 21 Aug 2008 15:51:17 +0900
Local: Thurs, Aug 21 2008 2:51 am
Subject: [ruby-core:18360] Re: Retrieving bytecode for method
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David Majda wrote:
> Michael Neumann napsal(a):
>> I'd love to experiment with translating the bytecode into a different
>> language (maybe Javascript), that's why I am ask :)

> FYI, a project that translates YARV bytecode into JavaScript already
> exists:

>   http://hotruby.yukoba.jp/

Thanks. I already know of this project (which is great btw) and I am
working on something similar (http://www.ntecs.de/projects/rubyjs), but
I want to generate Javascript instead of interpreting Ruby in
Javascript. A combination of both would of course be perfect :)

Regards,

   Michael


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Michael Neumann  
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 More options Aug 21 2008, 3:56 am
From: Michael Neumann <mneum...@ntecs.de>
Date: Thu, 21 Aug 2008 16:56:57 +0900
Local: Thurs, Aug 21 2008 3:56 am
Subject: [ruby-core:18362] Re: Retrieving bytecode for method
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I solved this myself with extending class Method and UnboundMethod for
method #iseq. See the attached patch.

Regards,

   Michael

[ ruby.iseq.diff 1K ]
Index: proc.c
===================================================================
--- proc.c      (revision 18724)
+++ proc.c      (working copy)
@@ -1332,6 +1332,18 @@
     return method;
 }

+static VALUE
+method_iseq(VALUE method)
+{
+    struct METHOD *data;
+
+    Data_Get_Struct(method, struct METHOD, data);
+
+    VALUE iseqval = (VALUE)data->body->nd_body;
+
+    return iseqval;
+}
+
 int
 rb_node_arity(NODE* body)
 {
@@ -1790,6 +1802,7 @@
     rb_define_method(rb_cMethod, "name", method_name, 0);
     rb_define_method(rb_cMethod, "owner", method_owner, 0);
     rb_define_method(rb_cMethod, "unbind", method_unbind, 0);
+    rb_define_method(rb_cMethod, "iseq", method_iseq, 0);
     rb_define_method(rb_mKernel, "method", rb_obj_method, 1);
     rb_define_method(rb_mKernel, "public_method", rb_obj_public_method, 1);

@@ -1807,6 +1820,7 @@
     rb_define_method(rb_cUnboundMethod, "name", method_name, 0);
     rb_define_method(rb_cUnboundMethod, "owner", method_owner, 0);
     rb_define_method(rb_cUnboundMethod, "bind", umethod_bind, 1);
+    rb_define_method(rb_cUnboundMethod, "iseq", method_iseq, 0);

     /* Module#*_method */
     rb_define_method(rb_cModule, "instance_method", rb_mod_instance_method, 1);


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